Nice selection of cantrip and spells.

Should the save DC be 8 + proficiency bonus + Wisdom? Because you could only max that at 12 if not.

Makes sense if the character has proficiency in arcane spells, but this feat was meant to be independent of class.  The low save DC balances the higher power of this feat.

Quote from DaveCampbell >>

Makes sense if the character has proficiency in arcane spells, but this feat was meant to be independent of class.  The low save DC balances the higher power of this feat.

I don't think there's any need to balance it in this way; take a look at Wood Elf Magic which comes with a cantrip, 1st level spell and 2nd level spell all able to be used at full effect. If you had only two spells (Gust of Wind and Warding Wind?) then although these are two 2nd level spells, I don't think they're overly powerful for a once day effect, especially as both are concentration (so you can't use them at the same time).

Does D&D Beyond even support a save DC of 8 + ability modifier with no proficiency? When I select a spell to add it only asks for the ability, I think it always adds proficiency automatically.

I suppose if D&D Beyond adds the proficiency automatically to the DC, then we can assume it is implied in the description I guess.  I will try to research it, but I think whatever the rule should be or is automatically will be fine.  I don't have a strong argument either way and this feat has not had sufficient playtesting yet.  I will respond again if I discover something significant.

I don't have a Aaracokra character to test, but I tried adding Magic Initiate to another character.  D&D Beyond seems to be giving me a DC of 10+ability bonus.  It doesn't seem like the proficiency bonus has been added automatically.  Of course, my feat may not work properly because it is not easy to set these up just right in the system.  But it seems like a DC that just includes the ability bonus may be considered valid.  However, please adjust this feat for your campaign however you like.

I for one think that the Aarakocra should have a 'unique' trait (flying has been taken by dragonborn sorcerer), other than having traits of a bird. So I love this idea.

Aarokocra: The Last Airbender

I like that I maybe put that in my d&d game.

Instead of this only being a magical based action physical attributes can be added to the ability. The Aarakocra can just use the strength of their wings and other physical attributes of their bodies to come up with unique attacks or other actions that connect them to Air. For example, large enough wings that move in a certain angle can create a gust of wind to cause the body of the object to hover or push against or push an opposing object away if force used is stronger than the mass of the object. Love the idea behind this, but would like to see more enfaces on the physical anatomy capabilities of the Aarakocra.

I agree.  However, I made this item for a campaign where there was an increase in elemental magic, so that is why the source of the abilities is elemental magic.  I do think there could be a feat for Aarakocra based only on their physical ability though.

Swap out (WIS) for (STR) and bing, bang , boom. Wind "magic" generated by the physical capabilities of the wings to push high volumes of air in a split second.